Xerox 7700DX - Phaser Color Laser Printer, Service Manual

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Phaser 7700 Color Laser Printer Service Manual 2-49
12 09-380 ERROR 12 YELLOW ATC SENSOR FAILURE
Note
If this failure reoccurs three times successively, an Engine NVRAM
value is set preventing further printer use until the NVRAM Access /
Clear Tech Rep Fault / Clear <09-380 ~ 09-383> is run.
Note
If necessary, enter Service Diagnostics Mode and run the “Clear
Tech Rep Fault” procedure on page 6-149.
Remove the Rear Cover (RRP 1, on page 7-154) and Rear Shield (RRP 9, on page 7-163).
Measure the voltage at P534-2 (see figure page 2-46) on the Engine Control Board.
Does the voltage measure b1 VDC and +3 VDC?
Yes No
Measure the voltage at P534-3 (see figure page 2-46) on the Engine Control Board.
Does the voltage m5 VDC?
Yes No
Replace the Engine Control Board.
Remove the Rear Cover (RRP 1, on page 7-154) and Rear Shield (RRP 9, on page
7-163).
Measure the voltage at P534-1 (see figure page 2-46) on the Engine Control Board.
Does the voltage measure 0 VDC?
Yes No
Replace the Engine Control Board (RRP 42, on page 7-206).
Remove the Print Cartridge Plate Cover (RRP 24, on page 7-179).
Inspect the wiring harness between the Engine Control Board and the Developer
Housing Assembly.
Is the wiring harness in good condition?
Yes No
Repair or replace as necessary.
Replace the Developer Housing Assembly (RRP 27, on page 7-185).
Replace the Engine Control Board (RRP 42, on page 7-206).
Note
Run approximately 10 pages of solid fill full-page prints of this
primary color to ensure this error is cleared.
Error
Code
Chain /
Link
Front Panel Message